<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <!-- <form>
.
input 元素
.
</form> -->

    <!-- <form> -->
    <!-- First name: <input type="text" name="firstname"><br> -->
    <!-- Last name: <input type="text" name="lastname"> -->
    <!-- </form> -->
    <!-- 密码字段 -->
    <!-- 密码字段通过标签<input type="password"> 来定义: -->

    <!-- <form> -->
    <!-- Password: <input type="password" name="pwd"> -->
    <!-- </form> -->

    <!-- 单选按钮（Radio Buttons） -->
    <!-- <form> -->
    <!-- <input type="radio" name="sex" value="male">Male<br> -->
    <!-- <input type="radio" name="sex" value="female">Female -->
    <!-- </form> -->
    <!-- 复选框（Checkboxes） -->
    <!-- <form> -->
    <!-- <input type="checkbox" name="vehicle" value="Bike">I have a bike<br> -->
    <!-- <input type="checkbox" name="vehicle" value="Car">I have a car -->
    <!-- </form> -->
    <!-- 提交按钮(Submit Button) -->
    <!-- <form name="input" action="html_form_action.php" method="get"> -->
    <!-- Username: <input type="text" name="user"> -->
    <!-- <input type="submit" value="Submit"> -->
    <!-- </form> -->
</body>

</html>